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Using Homing Traces for Simplifying Passive Testing of Discrete Event systems

Using Homing Traces for Simplifying Passive Testing of Discr...

引用

2022 International Russian Automation Conference, RusAutoCon 2022

作者： Tvardovskii, Aleksandr Yevtushenko, Nina National Research Tomsk State University Tomsk Russia Ivannikov Institute for System Programming of the Ras Moscow Russia

ISBN: (数字)9781665466554

ISBN: (纸本)9781665466554

The paper continues to study the use of state identification sequences for simplifying passive testing of discrete event systems. The knowledge of the current state of an implementation under test (IUT) which behavior is described by a Finite State Machine (FSM), can be utilized for effective monitoring only some critical properties or only some properties at critical states. The state identification can be performed by observing so-called homing IUT traces, i.e. input/output sequences which take the IUT to a known state independently of the initial state. In this work, we discuss homing trace derivation for FSMs which can be nondeterministic and partial. We also prolong the results obtained for classical Finite State Machines for those with timeouts, since nowadays, time aspects became very important for software and hardware systems. © 2022 IEEE.

关键词： Discrete event simulation

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MPI-Based PFEM-2 Method Solver for Convection-Dominated CFD Problems 16th

MPI-Based PFEM-2 Method Solver for Convection-Dominated CFD...

引用

16th International Conference on Parallel Computational Technologies, PCT 2022

作者： Popov, Andrey Marchevsky, Ilia Bauman Moscow State Technical University Moscow Russia Ivannikov Institute for System Programming of the RAS Moscow Russia

ISBN: (纸本)9783031116223

The description of the parallel solver of the Particle Finite Element Method, 2nd generation (PFEM-2), is given. Strategies for the parallelization of both mesh-related and particle-related substeps are outlined. The software implementation is based on the open-source FEM code ***. The parallel solution of incompressible Navier–Stokes equations with the excluded convective term is performed with the out-of-box tools of *** using additional libraries such as Trilinos and p4est. Several MPI-based subroutines are developed for particle transport processing, as well as for particle/mesh field projection operations. The presented PFEM-2 solver allows for simulating convection-dominated flows with a high CFL number on relatively coarse meshes. The submesh resolution of the velocity field is maintained by particles. The results of simulation and speed-up of computations for test problems using multi-core/multi-processor systems are shown. © 2022, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Finite element method

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Analysis of wake around DARPA Suboff including self-propulsion with a seven-blade propeller in positive pitches

Analysis of wake around DARPA Suboff including self-propulsi...

引用

2022 Ivannikov Open Conference, ISPras 2022

作者： Wang, Xinyu Zhang, Qin Qin, Yingfan Wang, Tianyuan Wang, Zhicheng Epikhin, Andrey Ocean University of China College of Engineering Qingdao China Programming of the Ras Ivannikov Institute for System Moscow Russia

ISBN: (纸本)9798350398533

The Delayed Detached Eddy Simulation(DDES) of the DARPA Suboff, including self-propulsion with sail, fins and seven-blade propeller, is performed at high Reynolds number and pitch-angle inflow besed OpenFOAM, the mixing evolution and energy performance of the vortex structure have been focused. Computations of Suboff are validated against reference data, simulation and experiment of the propeller are carried out simultaneously under the condition of high blade load (J = 0). The time-averaged, phase-averaged, instantaneous vorticity fields and power spectral density (PSD) around the submarine including self-propulsion, are reported under oblique inflow with drift angles of 0°, 7° and 15°. Computations demonstrate that the oblique inflow will deflect and attenuate the horseshoe vortex behind the sail resulting in no longer interacting with fin. Besides, it will speed up the process of the vortex dissipation to a certain extent. With the increase of inflow angle, the hydrodynamic performance of the propeller will have an increasing trend, but the trend will decrease. The fin-sheet vortex accelerates the instability process of the leeward wake, moreover, the horizontal fin-sheet vortex and propeller wake will deflect leeward with the inflow-angle increasing, varying the area of interaction. It is worth noting that the tip-vortex induced by leeward fin is attracted to wake, resulting in the abnormal wake under 15° inflow, and drift opposite to the rotation direction of the propeller. © 2022 IEEE.

关键词： Wakes

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Validation of the developed open source library for far-field noise prediction 27

Validation of the developed open source library for far-fiel...

引用

27th International Congress on Sound and Vibration, ICSV 2021

作者： Epikhin, Andrey Ivannikov Institute for System Programming RAS Moscow Russia Bauman Moscow State Technical University Moscow Russia

ISBN: (纸本)9788378807995

The paper is focused on the validation of the developed open-source library libAcoustics for the far-field noise prediction by means of integral acoustic analogy. The library uses OpenFOAM for the near-field flow calculation and is available online at GitHub. Two benchmark cases with different formulations for computing the Ffowcs Williams and Hawkings equation are considered. In the first one, the spectrum of the acoustic noise generated by a rod-airfoil configuration is investigated. The near-field is calculated using large eddy simulation with a low-dissipation scheme, the far-field noise is predicted by a formulation based on the Garrick triangle. In the second case, acoustic perturbations generated by the compressible jet at a low Reynolds number are analyzed. Acoustic noise calculations are performed for the jet with Mach 0.9 and Reynolds number 3600 using Farassat 1A formulation. The obtained time-averaged and pulsating flow parameters and far-field noise have been compared with the available experimental data. The results of numerical simulations show a good agreement with the reference data. Thus, the developed library exhibits the potential for solving a wide range of computational aeroacoustics problems. © "Advances in Acoustics, Noise and Vibration - 2021" Proceedings of the 27th International Congress on Sound and Vibration, ICSV 2021. All rights reserved.

关键词： Acoustic noise

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Test Derivation against Timed Finite State Machines with Output Timed Guards

Test Derivation against Timed Finite State Machines with Out...

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2023 International Russian Automation Conference, RusAutoCon 2023

作者： Tvardovskii, Aleksandr Yevtushenko, Nina National Research Tomsk State University Tomsk Russia Ivannikov Institute for System Programming of the Ras Moscow Russia

ISBN: (纸本)9798350345551

Approaches based on state machines are widely used to obtain guaranteed error coverage tests for discrete event systems. Many modern systems have time-dependent components, and thus, state machines are extended with clock variables and various time aspects, i.e. test synthesis methods must be adapted to new timed models. In this article, we consider Finite State Machines (FSM) with timeouts, input and output timed guards and show, how a test suite with guaranteed error coverage can be derived based on this model. The fault model and test derivation methods are based on the abstraction of the timed machine, i.e., on the FSM that describes the relevant aspects of the timed behavior. We consider two strategies for obtaining complete test suites under the assumption that the specification can be non-deterministic. © 2023 IEEE.

关键词： Discrete event simulation

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Perspectives of system Informatics 1

引用

丛书名： Lecture Notes in Computer Science

1000年

作者： Alexander K. Petrenko Andrei Voronkov

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Mixed characteristic discontinuous Galerkin approach for perfect gas dynamics modeling 4

Mixed characteristic discontinuous Galerkin approach for per...

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4th Virtual Workshop on Numerical Modeling in MHD and Plasma Physics: Methods, Tools, and Outcomes, MHD-PP 2021

作者： Gatsuk, V.K. Lukin, V.V. Bauman Moscow State Technical University Moscow Russia Keldysh Institute of Applied Mathematics RAS Moscow Russia Ivannikov Institute for System Programming RAS Moscow Russia

The numerical method based on the discontinuous Galerkin (DG) approach for perfect inviscid compressible gas dynamics modelling is developed. The approximate Riemann solvers in combination with gas dynamics equations system characteristic properties are used to calculate the numerical fluxes on the cells interfaces and inside the cells. A number of approximate Riemann solvers are considered. The solution characteristic decomposition is used in the similar to PPML way. The developed algorithm is tested using problems with smooth and discontinuous solutions. Both one-dimensional and two-dimensional test problems are considered. The method provides accurate discontinuity resolution and ability to compute gas-dynamic instabilities with minimal artificial distortion. © 2021 institute of Physics Publishing. All rights reserved.

关键词： Gas dynamics

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Symbolic Security Predicates: Hunt Program Weaknesses

Symbolic Security Predicates: Hunt Program Weaknesses

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2021 Ivannikov Ispras Open Conference, ISPras 2021

作者： Vishnyakov, Alexey Logunova, Vlada Kobrin, Eli Kuts, Daniil Parygina, Darya Fedotov, Andrey Ivannikov Institute For System Programming Of The Ras Russia Lomonosov Moscow State University Russia Moscow Institute Of Physics And Technology Moscow Russia

ISBN: (纸本)9781665423304

Dynamic symbolic execution (DSE) is a powerful method for path exploration during hybrid fuzzing and automatic bug detection. We propose security predicates to effectively detect undefined behavior and memory access violation errors. Initially, we symbolically execute program on paths that don't trigger any errors (hybrid fuzzing may explore these paths). Then we construct a symbolic security predicate to verify some error condition. Thus, we may change the program data flow to entail null pointer dereference, division by zero, out-of-bounds access, or integer overflow weaknesses. Unlike static analysis, dynamic symbolic execution does not only report errors but also generates new input data to reproduce them. Furthermore, we introduce function semantics modeling for common C/C++ standard library functions. We aim to model the control flow inside a function with a single symbolic formula. This assists bug detection, speeds up path exploration, and overcomes overconstraints in path predicate. We implement the proposed techniques in our dynamic symbolic execution tool Sydr. Thus, we utilize powerful methods from Sydr such as path predicate slicing that eliminates irrelevant constraints. We present Juliet Dynamic to measure dynamic bug detection tools accuracy. The testing system also verifies that generated inputs trigger sanitizers. We evaluate Sydr accuracy for 11 CWEs from Juliet test suite. Sydr shows 95.59% overall accuracy. We make Sydr evaluation artifacts publicly available to facilitate results reproducibility. © 2021 IEEE.

关键词： Errors

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Sydr-Fuzz: Continuous Hybrid Fuzzing and Dynamic Analysis for Security Development Lifecycle

Sydr-Fuzz: Continuous Hybrid Fuzzing and Dynamic Analysis fo...

引用

2022 Ivannikov Open Conference, ISPras 2022

作者： Vishnyakov, Alexey Kuts, Daniil Logunova, Vlada Parygina, Darya Kobrin, Eli Savidov, Georgy Fedotov, Andrey Ivannikov Institute for System Programming of the Ras Russia Moscow Institute of Physics and Technology Moscow Russia Lomonosov Moscow State University Russia

ISBN: (纸本)9798350398533

Nowadays automated dynamic analysis frameworks for continuous testing are in high demand to ensure software safety and satisfy the security development lifecycle (SDL) requirements. The security bug hunting efficiency of cutting-edge hybrid fuzzing techniques outperforms widely utilized coverage-guided fuzzing. We propose an enhanced dynamic analysis pipeline to leverage productivity of automated bug detection based on hybrid fuzzing. We implement the proposed pipeline in the continuous fuzzing toolset Sydr-Fuzz which is powered by hybrid fuzzing orchestrator, integrating our DSE tool Sydr with libFuzzer and AFL++. Sydr-Fuzz also incorporates security predicate checkers, crash triaging tool Casr, and utilities for corpus minimization and coverage gathering. The benchmarking of our hybrid fuzzer against alternative state-of-the-art solutions demonstrates its superiority over coverage-guided fuzzers while remaining on the same level with advanced hybrid fuzzers. Furthermore, we approve the relevance of our approach by discovering 85 new real-world software flaws within the OSS-Sydr-Fuzz project. Finally, we open Casr source code to the community to facilitate examination of the existing crashes. © 2022 IEEE.

关键词： Pipelines

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Verifying cryptographic protocols by Tamarin Prover

Verifying cryptographic protocols by Tamarin Prover

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2020 Ivannikov Memorial Workshop, IVMEM 2020

作者： Vinarskii, Evgenii Demakov, Alexey Kamkin, Alexander Yevtushenko, Nina Moscow Institute of Physics and Technology Higher School of Economics Ivannikov Institute for System Programming of the Ras Lomonosov Moscow State University Moscow Russia

ISBN: (纸本)9781728190884

Cryptographic protocols are utilized for establishing a secure session between 'honest' agents which communicate strictly according to the protocol rules as well as for ensuring the authenticated and confidential transmission of messages. The specification of a cryptographic protocol is usually presented as a set of requirements for the sequences of transmitted messages including the format of such messages. Note that protocol can describe several execution scenarios. All these requirements lead to a huge formal specification for a real cryptographic protocol and therefore, it is difficult to verify the security of the whole cryptographic protocol at once. In this paper, to overcome this problem, we suggest verifying the protocol security for its fragments. Namely, we verify the security properties for a special set of so-called traces of the cryptographic protocol. Intuitively, a trace of the cryptographic protocol is a sequence of computations, value checks, and transmissions on the sides of 'honest' agents permitted by the protocol. In order to choose such set of traces, we introduce an Adversary model and the notion of a similarity relation for traces. We then verify the security properties of selected traces with Tamarin Prover. Experimental results for the EAP and Noise protocols clearly show that this approach can be promising for automatic verification of large protocols. © 2020 IEEE.

关键词： Cryptography

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